my period ended on the 20th i had sex on the 21,24,30 and i have been cramping. its not like period cramps its more like gas cramps but in my uterus it comes and goes. i never had any cramps or implantation bleeding with the other two and i no every pregnancy is different. i have taken a pregnancy test it came out neg and i no its to early to test but is it possible that i could be pregnant? my last period was on the 15th and ended on the 20th i normally go 7 days but this time it was 6. i have been to the ob she told me my heath was good and my next period is due some were around the 12th of August